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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2720196593a314ed4e9e2db1f4a0f15ef6f87c845241b507b9bebcc15c8472' 
  AND token = 'DjVXbSyYwYKY98FsQ00KwYplj9ObUcJSjMNqp0JLytc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}